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. and in that environment, you have then the ejection of alpha, beta and gamma particles. so it's almost simple geometry. right now, this particle we'd call an alpha particle. this is a helium nucleus. and i'll write that helium nucleus like this. and i'll put a two down here and a four here. and this nomenclature, i hope you're familiar with. this is simply the atomic number. it tells you it's atomic number two in the periodic table of substances, yeah? it's got two positive charges. and the four refers to the atomic mass unit. and that's the number of nucleons altogether. i call this, by the way, nucleons. i can call you a people, a person, but a person can be a male or female. nucleon can be a proton or neutron. see what i'm saying? but there's four nucleons altogether, so it has a mass of four and atomic number two. so that would be the configuration. if i put another proton in there, then it would now be-- does anyone know? it would be the element lithium because now it would have three and up here would be five. and any nucleus that has three protons, by definition and by chemical properties, will
into an environment of heavy balls or light balls? heavy balls. and you want the thing to slow down. let me ask you this. if i take a ball and i throw it against a brick wall-- [makes sounds] --when it bounces off, will it bounce off a lot slower or about the same? about the same. about the same. if i take a golf ball and i throw it against a bowling ball, is that bowling ball gonna slow the golf ball down? no, it's not. so what you do is you take the golf ball and you throw into an arena of ping-pong balls. and if you do that, it will give what? give the energy to ping-pong ball and it itself will slow down. and so what do you do is you take these things and you bounce them off atoms like the size of carbon. did you ever hear about the heavy water? you bounce them off light atoms or molecules and these things will slow down, so they're moderated and will cause the reaction of more of this fission. you call--nuclear fission, gang, breaking apart, nuclear fission, and you will fission more atoms. anyway, this is something that cause an awful lot of excitement. because along with these two, it turns
on the environment. president obama renewed his commitment to "freeing ourselves from foreign oil" in his reelection victory speech last week. energy department data shows u.s. imports of crude had fallen 11% this year and the country is on track to produce the most oil since 1991. the syrian military continues to launch attacks on the border town, sending hundreds of civilians fleeing to neighboring turkey. the new bombings come days after more than 11,000 syrian civilians were forced out during strikes last week, one of the largest refugee flights of this year in conflict to date. speaking in geneva, the head of disaster in crisis management at the international federation of red cross and red crescent societies warned turkey needs major aid to handle the growing number of syrian refugees. >> we have seen a doubling of the camp population since july 2012, and i think as you have seen over the last few days, there has been an increase in the number of syrians moving into turkey. they now recognize the situation is becoming prolonged. the initial thoughts the population might be displaced for shorte
in their own environment. i feel that when we come back from a home visit, which is usually done in the beginning of the year for the first time, i'm able to understand the parent and the child better. hendrick: many of us, especially those who work with infants, are the child's and the parents' first real contact with the outside world. this presents us with a unique opportunity for becoming closely involved and attached to our infants and family members. hi. hi. but how do we form a bond with our children without becoming overly attached? where do we begin? we can start by making sure the lines of communication between ourselves and the family members are wide open. he has not eaten this morning. he was a good little boy, even though his sister woke him up. sissy wake you up? yes, she did. did sissy wake you up this morning? he's probably hungry. are you hungry? hendrick: one way is by looking for opportunities to find out what's happening at home. families are under a great deal of stress these days for any number of reasons. they might regret having to leave their child with
Search Results 0 to 3 of about 4